During the 1990s, two highly-modified S-76s were used to develop technologies embodied later in the RAH-66 "Comanche". The Shadow (Sikorsky Helicopter Advanced Demonstrator and Operator Workload) S-76 in the foreground evaluated the built-on nose-mounted single-seat cockpit, with features such as fly-by-wire sidestick control, a voice interactive system and state- of-the-art combat avionics. The rear aircraft flew extensively to determine the optimum size and shape of the type of shrouded tail rotor once fitted temporarily to the S-67 "Blackhawk".

John W.R. Taylor "Images of America - Sikorsky", 1998

Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for mysql5.zone.ee failed: Name or service not known in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/sik_shadow.php on line 56

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for mysql5.zone.ee failed: Name or service not known in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/sik_shadow.php:56 Stack trace: #0 /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/sik_shadow.php(56): mysqli_connect('mysql5.zone.ee', 'd14657sa18989', Object(SensitiveParameterValue)) #1 {main} thrown in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/sik_shadow.php on line 56